Friction-spuing for



vUNITED STATS PATENT OFFICE.

E. D. WILLIAMS, OF PHILADELPHIA, PENNSYLVANIA.

FRICTION-SPRING FOR SUPPORTING WINDOW-SASH.

Specication of Letters Patent No. 24,254, dated May 81, 1859.

To all whom it may concern:

Be it known that I, E. D. WILLIAMS, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and ImprovedSash Friction-Spring and Stopper; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings and the letters of reference markedthereon. v

The nature of my invention consists in providing sash friction springswith a projection or spur on their friction or bearing surfacessharpened so that the projection or spur shall cut a groove in which theprojection or spur shall slide to prevent the sash from rattling.

Of the accompanying drawings, which make a part of this schedule, Figurel is a general view of one of my improved friction springs of which (a)is the sharpened projection or spur, the edge or point at (a) beingsharpened, as seen in Fig. 2. The part (c) is driven tightly into thesash to secure the spring in the proper place. The part (r) worksloosely in a hole provided for that purpose so as to keep the elasti-cor moving end of the spring in the proper position.

Fig. 3 is a view of a sash and frame the sash being furnished with myimprovement, as seen at (a-aaa) of springs (B- B-B-B), parts of the sashand frame being removed so as to show the working position of thefriction springs. rIhe sash is represented partly hoisted and stopped bythe spring B" which has sunk into the mortise indicated by the line(t-zf) the right-angular shoulder of the spring bearing on the shoulderof the mortise in the frame. is a mortise to receive the part (rm) whenthe sash is unlocked.

To enable others skilled in the art to make and use my invention, I willproceed to describe the manner of so doing.

Bend a piece of spring wire into the shape represented generally by Fig.1 hereof. Sharpen the projection (a) to an edge at the highest surfaceline. At each corner of the sash, on the perpendicular edges afx one ofthe springs so that the sharp edge of the projection (a) shall bearagainst the frame when the sash is in its working place. A groove shouldbe cut in the edge of the sash for each spring so that the body of theedge of the projection (a) will cut a groove i for itself in the outsideframe in which it will remain; thus preventing the sash from rattling.But when it shall have sunk the spring into the frame so as 'to causethe broadest'surface to bear aga-inst the surface of the frame, it willcease to sink into the frame faster than the spring would do if it hadno sharpened projection.

Stopping or locking the sash is provided for by sinking a mortise intothe outside frame at the desired point, so that the bottom of themortise shall have a square shoulder When the sash is raised so as tobring the spring intended for the purpose opposite the mortise, thespring will be projected into the mortise by its own elasticity, and itssquare shoulder will stand on the shoulder of the mortise. To providefor unlocking and letting the sash down, extend the part of the lockingspring to the point at which make a suitable projection for operatingthe spring-cut a mortise in the bottom of the sash to receive theextended part (r) deep enough to ,allow the projection to sink below thelevel ofthe bottom edge of the sash. By pressing the projection (n)upward and from the edge of the sash the sash is unlocked. By treating aspring at an upper corner in like manner the sash may be locked down.

This contrivance has the advantage of being entirely out of sight,except the small projection (n) when the sash is locked. It

1s very cheap and by cutting its own groove saves much useful labor.

IVhat I claim and desire to secure by Letters Patent is Providing sashwith friction springs having sharpened projections or spurs for cuttingtheir own grooves substantially as above set forth.

E. D. WILLIAMS.

Witnesses GEORGE G. BROWNE, JOSEPH GRAHAM.

